MAKEALL: add missing 512x boards in ppc

Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>

MAKEALL

diff --git a/MAKEALL b/MAKEALL
index 20ef4e1..a02412b 100755
--- a/MAKEALL
+++ b/MAKEALL
@@ -378,6 +378,7 @@
 
 LIST_ppc="		\
 	${LIST_5xx}	\
+	${LIST_512x}	\
 	${LIST_5xxx}	\
 	${LIST_8xx}	\
 	${LIST_8220}	\